mknod --help: note that this command may be a shell built-in

* src/mknod.c (usage): Print USAGE_BUILTIN_WARNING.
Suggestion from Eric Blake.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mknod.c b/src/mknod.c
index 8a1718d6b..445117c90 100644
--- a/src/mknod.c
+++ b/src/mknod.c
@@ -83,6 +83,7 @@ otherwise, as decimal.  TYPE may be:\n\
   c, u   create a character (unbuffered) special file\n\
   p      create a FIFO\n\
 "), stdout);
+      printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
       emit_bug_reporting_address ();
     }
   exit (status);